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High-temperature oxidation behaviour of Mo-40Ti-30Si (at.%) alloy was investigated in the temperature regime of 900-1300 ∘ C in air. Isothermal weight change data recorded up to 100 h of exposure revealed parabolic weight gain kinetics at all the tested temperatures. The protective oxide scale composed with SiO 2  (silica) and TiO 2  (titania) forming a duplex oxide microstructure consisting of TiO 2  particles embedded in the continuous SiO 2  matrix. The oxide scale showed parabolic growth kinetics, and the activation energies for the scale growth were found to be 72.2 kJ/mol in 900-1200 ∘ C and 324.9 kJ/mol in 1200-1300 ∘ C. The kinetics of the protective scale growth on the alloy surface was mainly controlled by the growth of the silica film and the inward diffusion of oxygen through the duplex oxide layer.

Kinetics of oxide scale growth on a (Ti, Mo) 5 Si 3 based oxidation resistant Mo-Ti-Si alloy at 900-1300 ∘ C